Hendrickson 1950 Kyle Labialci Nov. 15 Bogota, 8500ft., Cundinamarca, Colombia, S.A. water (away from the shoreline), of tenest in an area of emergent plant stoms. Almost all were in areas covered with the "duckweed" mat; usually only the head and part of the back was visible. When frightened they ducked down under the duckweed mat; only a few were observed to push up through it again, a short distance from the original spot. Following are a few temperature records: (The day was heavily overcast at this time) 4: 45 P.M. frog = 20.2° C.; water = 20.4° C.; air = 15.1° C. (amplexed 5:00 P.M. pair) frog (2) = 17.1° C.; water = 17.5° C.; air = 13.3° C. 5:17 P.M. frog = 18.8° C.; water = 20.3° C.; air = 13.0° C. 5:20 P.M. frog = 17.4° C.; water = 18.0° C. air = 13.1° C. At 5:23 found a frog sitting, half-submerged, on a mat of duckweed (partially submerged by frog's weight). To me, its croak sounds like: waah .... waah .... waah See Dr. Stebbins notes for tone analysis and diagrams of croaking frogs. The number of calls were: in 15 seconds timing - 17 calls in 30 "" "" - 24 calls in 15 "" "" - 12 calls in 30 "" "" - 29 calls